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Thread: Warm water on icy windshield

  1. #1

    Default Warm water on icy windshield

    Has anyone ever actually seen an icy windshield break from lukewarm to warm water (warm means I can submerge my hand in it comfortably)?

    I clear my windows many times this way. Anyone else?

    I've seen a non-tempered glass pitcher break with boiling water, but I've never seen or met someone who actually cracked or shattered their windshield with warm water.

  2. #2
    Flashaholic* MSaxatilus's Avatar
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    Default Re: Warm water on icy windshield

    I do it all the time. Never had a problem.

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    *Flashaholic* Sgt. LED's Avatar
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    Default Re: Warm water on icy windshield

    I've done this before too but never with hot water.

    I once had to pee on a windshield because the ice was too thick and I had to get moving ASAP.

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    Default Re: Warm water on icy windshield

    Quote Originally Posted by Sgt. LED View Post
    I've done this before too but never with hot water.

    I once had to pee on a windshield because the ice was too thick and I had to get moving ASAP.


    I've used warm water in the past, the only problem I had was when I got going, that warm water got ice cold and refroze to the windshield. Had to stop and wait the entire windshield to warm up anyway.

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    Default Re: Warm water on icy windshield

    I've done this too - no problems. Generally glass has a lot more problems being cooled rapidly, as this puts the surface in tension. Heating the surface put the surface in compression, which glass and most ceramics can take a lot of.
    Carpenter - what works for me is to squigee it off right away.
    This might be a good question for Car Talk.

  6. #6

    Default Re: Warm water on icy windshield

    Quote Originally Posted by Carpenter View Post


    I've used warm water in the past, the only problem I had was when I got going, that warm water got ice cold and refroze to the windshield. Had to stop and wait the entire windshield to warm up anyway.
    had that happen too. They used to make a thing you could wrap around your heater hose and hook to the windshield washer to heat it up so in the winter it would clear the windows quicker but haven't seen anything like it since maybe they had it too hot and cracked the glass.
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    Default Re: Warm water on icy windshield

    Quote Originally Posted by Lynx_Arc View Post
    had that happen too. They used to make a thing you could wrap around your heater hose and hook to the windshield washer to heat it up so in the winter it would clear the windows quicker but haven't seen anything like it since maybe they had it too hot and cracked the glass.
    They have electrical version of that now.

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    Default Re: Warm water on icy windshield

    u peed on your windshield? lmao

    did u stand on a stool?

    madi05

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    Default Re: Warm water on icy windshield

    Quote Originally Posted by hyperslug View Post
    Has anyone ever actually seen an icy windshield break from lukewarm to warm water (warm means I can submerge my hand in it comfortably)?

    I clear my windows many times this way. Anyone else?

    I've seen a non-tempered glass pitcher break with boiling water, but I've never seen or met someone who actually cracked or shattered their windshield with warm water.

    yes i have seen a few windshields on cars and windows on homes break because of warm water in winter

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    Administrator Norm's Avatar
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    Default Re: Warm water on icy windshield

    Quote Originally Posted by Sgt. LED View Post
    I once had to pee on a windshield because the ice was too thick and I had to get moving ASAP.
    What did the neighbours say?

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    *Flashaholic* Sgt. LED's Avatar
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    Default Re: Warm water on icy windshield

    Quote Originally Posted by madi05 View Post
    u peed on your windshield? lmao

    did u stand on a stool?

    madi05
    I just aimed extra high and let gravity take over. I didn't have a source for anything warmer right then.
    Since nobody else has admitting to doing this I'll expand on it and say that I did it another time in the parking lot at work. I had an empty 1 litre water bottle and filled that up then got out of the car and poured it on the windshield. That time my heater went out of whack on me without warning so I did what I figured would work. I had to go anyway!
    Maybe I like being self sufficient a little too much?

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    *Flashaholic* Sgt. LED's Avatar
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    Default Re: Warm water on icy windshield

    Quote Originally Posted by Norm View Post
    What did the neighbours say?
    Nobody around for a mile or more, I was unobserved for that thawing!

  13. #13
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    Default Re: Warm water on icy windshield

    alaskawolf - do you recall what the air temperature was at the time?

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    Default Re: Warm water on icy windshield

    I have used water lots before ~ fairly hot ~

    Used a mag 623 last night ~ and that works very well ( on the frozen locks aswell )

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    Default Re: Warm water on icy windshield

    Quote Originally Posted by LED_Thrift View Post
    alaskawolf - do you recall what the air temperature was at the time?
    I'm also curious.

    I'm thinking that it's more of an absolute 'difference in temperature' thing than WARM vs HOT water.

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    Default Re: Warm water on icy windshield

    My older brother cracked the windshield on our parent’s car on a cold morning. It was in the mid 1980's and we are leaving for school. I had done this many times with luke warm water, he brought out some "hot" water and poured it on and "SNAP". He swore to my dad it was tap water, so maybe 120F max? It was about 0F outside at the time. I didn't try it again after that for about 10 years and now only use warm water, it doesn't take hot water, just more water if it's cooler.
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    Default Re: Warm water on icy windshield

    Quote Originally Posted by Sgt. LED View Post
    I just aimed extra high and let gravity take over. I didn't have a source for anything warmer right then.
    Since nobody else has admitting to doing this I'll expand on it and say that I did it another time in the parking lot at work. I had an empty 1 litre water bottle and filled that up then got out of the car and poured it on the windshield. That time my heater went out of whack on me without warning so I did what I figured would work. I had to go anyway!
    Maybe I like being self sufficient a little too much?
    I can't believe you did that. One of the car prank is pee down somebody's HVAC intake so their AC stinks when used, but you did that to yourself.

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    Default Re: Warm water on icy windshield

    Thermal shock is never a good thing.. warm water is pushing it depending on the temp of the glass. Chemical thawing is the only safe way. Windshields are expencive.. lol

    i keep one of these in the trailblazer at all times..

    (Moderator note: Hot linked pic removed IAW CPF Rules.)


    Works great, even at -25F.
    Last edited by Sigman; 01-22-2009 at 05:26 AM. Reason: Hot linking not allowed.
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    Flashaholic* MarNav1's Avatar
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    Crazy Re: Warm water on icy windshield

    Quote Originally Posted by Sgt. LED View Post
    I've done this before too but never with hot water.

    I once had to pee on a windshield because the ice was too thick and I had to get moving ASAP.
    Reality is usually scoffed at and illusion is usually king. But in the battle for survival of western civilization it will be reality and not illusion or delusion that determines what the future will bring.

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    Default Re: Warm water on icy windshield

    Don't think I ever did that. And where I live I don't often have ice on the windshield.

    That said one cold arse morning it was also pissin' rain and that was freezing on the glass. What a PAIN!
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    Flashaholic* Sub_Umbra's Avatar
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    Default Re: Warm water on icy windshield

    Aside from the damage potential, warm water on an icy windschield is just silly. It's even more silly than using a hair dryer -- which some do also.

    I've heard of both of these methods being used in the sub-tropics. It's hard to keep a straight face. For those who don't understand -- it's ok -- your understanding is not required or expected. It's still funny.

  22. #22
    Flashaholic* addictedmatt's Avatar
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    Default Re: Warm water on icy windshield

    My car has heated wipers and fluid, and I rarely use them. By the time they are warm, the car is warm and I've had plenty of time to scrape the ice.


  23. #23
    *Flashaholic* LuxLuthor's Avatar
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    Default Re: Warm water on icy windshield

    Quote Originally Posted by Superdave View Post
    Thermal shock is never a good thing.. warm water is pushing it depending on the temp of the glass. Chemical thawing is the only safe way. Windshields are expencive.. lol

    i keep one of these in the trailblazer at all times..

    Edit:


    Works great, even at -25F.
    +1

    It appears that this contains 62% Methyl Alcohol, 6% Ethylene Glycol, & 32% water. I have seen other recommendations to use 1 part water : 2 parts rubbing (Isopropyl) alcohol.
    Last edited by LuxLuthor; 01-22-2009 at 06:20 PM. Reason: Hot linking not allowed.

  24. #24
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    Default Re: Warm water on icy windshield

    Never had any real problems with ice, even with a old ford Tempo that had a bit of a mind of its own in getting the fan and heater working and to top it off having a very slow coolant leak did not help much. I did however recall my front driver side tire was frozen to the cement one day after wondering why I could not move from the spot.

  25. #25
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    Default Re: Warm water on icy windshield

    I've used hot water (too hot to touch).. By the time I get outside its still evaporating (30 second walk at most). Its been working well for me. If it makes a difference, its a '97 car (with many chips and a small crack or two on the windshield, but nothing all the way through - all caused by pebbles).. But so far I've only used it at around 20-35 degrees F.

    I also use hot water if my whole car door is frozen shut. I'm don't think I'll ever take an ice scraper at my door/paint.

  26. #26
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    Default Re: Warm water on icy windshield

    Quote Originally Posted by LED_Thrift View Post
    alaskawolf - do you recall what the air temperature was at the time?
    usually under 0F

  27. #27
    *Flashaholic* Sgt. LED's Avatar
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    Default Re: Warm water on icy windshield

    Quote Originally Posted by jzmtl View Post
    I can't believe you did that. One of the car prank is pee down somebody's HVAC intake so their AC stinks when used, but you did that to yourself.
    Really? I've never used the AC in that car, I like to roll down the windows!

  28. #28
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    Default Re: Warm water on icy windshield

    That's fine sarge!
    You only need to pour booze on the windshield next to get rid of the smell; then of course since cops might find the smell suspicious, just use a good dosage of white spirit to drown the smell of booze; and then, if you need to pick up the gf from time to time, just pour a bottle of cologne down the windshield beforehand; and finally when you're going back to work and can't let the co-workers notice the girly smell, just simply defrost the windshield with old trusty again!
    Problem solved.

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  29. #29
    Flashaholic* abvidledUK's Avatar
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    Default Re: Warm water on icy windshield

    Chemical de-icer, windscreen demister, and patience is the best method.

    Anything else stresses the glass, may not crack then , but potentially weakens the glass so it is not as protective in an accident.

    ie, when something is hurtling towards you.

    IMHO warm water is just false economy.
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  30. #30
    Flashaholic* TONY M's Avatar
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    Default Re: Warm water on icy windshield

    Usually I try to de-ice it slowly by using the engines heat but in a hurry I have poured warm water over the windshield just to clear it quickly, maybe I shouldn't in future...

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